<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<script type="text/javascript">
		var date = new Date();
		alert(date instanceof Date);
		var string = new String();
		alert(string instanceof Array);
		var arr = new Array(1, 2, 3);
		alert(arr instanceof Array);
	</script>

</body>
</html>